exam Maths Puzzle Numerical Ability

Find a25 for thearitmetic sequence 1/2,1/5,-1,10,...

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exam Other Question

find a common solution for each system of equations:

y=x-1

y=2x-5 How do you solve the following:

4x-5y<41
2x-7<61
x+3y<-15
4y<-20

f(x,y)=9x-2y

Find the minimum and maximum value of the objective quantity?

I have looked everywhere